The federal government wants to lock up convicted garbage titan Chuck Rizzo Jr., saying he tampered with a crucial witness in his corruption case and doesn't deserve to be free on bond, according to a court filing Tuesday.

The document details an encounter between Rizzo Jr. and a witness at a casino — a meeting that could cost Rizzo a stiffer prison term when he is sentenced in March for bribery.

He faces up to 10 years, though prosecutors have recommended lowering it to 6 years, 3 months because of his cooperation in the case.

That could all change now.

According to the new filing, Rizzo contacted a crucial witness in the case during a Christmas party at a casino and went off on a rant. Rizzo Jr. blamed the witness for some of his legal troubles.

On Dec. 16, the witness and his wife went to the MGM casino hotel to watch a sporting event and have dinner at the TAP restaurant. He ran into an acquaintance who told him he was there to attend a Christmas party for Titan, a company owned by Rizzo and his father.

Soon he received a text from Rizzo's father that said, "I heard your (sic) here at MGM, I would love to say hi. Let me know where you're at."

But it was the younger Rizzo who met him.

"Chuck Rizzo began by berating Witness A, stating that it was Witness A’s fault that Rizzo was going to jail for as long as he was. Rizzo then chastised Witness A for telling federal authorities that their theft scheme from RES (Rizzo Environmental Services) started in 2014, which put the total of the stolen money over $500,000," court documents read.

Sentencing guidelines add to a defendant’s offense level if the amount of loss exceeds $550,000.

Rizzo tried "to influence him to say that a portion of the money that Rizzo was stealing from RES actually amounted to other people paying Rizzo back money that Rizzo had given them previously," the filing reads.

Rizzo also told the witness that he needs to meet with Rizzo's lawyers, according to the document, something the witness had previously declined to do. The witness reported the encounter to the FBI.

The filing says Rizzo "intentionally and blatantly" violated his bond conditions that required him to have no direct or indirect contact with the witness, and that he "attempted to intimidate, retaliate against, and tamper with a witness for the government."

The filing also says: "The government is concerned that Rizzo will seek to contact, either directly or indirectly, additional witnesses in a desperate attempt to reduce his sentencing exposure."

Rizzo Jr., who was a key government witness in a widespread corruption probe, pleaded guilty in November to bribery and wire fraud, admitting he lined the pockets of public officials to win lucrative contracts.